MdePkg/BaseLib: Support IA32 processors without CLFLUSH

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / ModU64x32.c

/** @file\r
  Calculate the remainder of a 64-bit integer by a 32-bit integer\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
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/**\r
  Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r
  generates a 32-bit unsigned remainder.\r
\r
  This function divides the 64-bit unsigned value Dividend by the 32-bit\r
  unsigned value Divisor and generates a 32-bit remainder. This function\r
  returns the 32-bit unsigned remainder.\r
\r
  @param  Dividend  A 64-bit unsigned value.\r
  @param  Divisor   A 32-bit unsigned value.\r
\r
  @return Dividend % Divisor\r
\r
**/\r
UINT32\r
EFIAPI\r
InternalMathModU64x32 (\r
  IN      UINT64                    Dividend,\r
  IN      UINT32                    Divisor\r
  )\r
{\r
  _asm {\r
    mov     eax, dword ptr [Dividend + 4]\r
    mov     ecx, Divisor\r
    xor     edx, edx\r
    div     ecx\r
    mov     eax, dword ptr [Dividend + 0]\r
    div     ecx\r
    mov     eax, edx\r
  }\r
}\r